38 results
Important Biostatistics and Epidemiology Equations

Sensitivity = TP / (TP + FN) = true positives / disease
Biostatistics #statistics ... #specificity #PPV ... #NPV
Sensitivity is the proportion of truly diseased persons in the screened population who are identified as
correctly diagnose a case ... that any given case ... Calculation #Table #PPV ... #NPV #Formulas ... #Statistics #Matrix
â–º
Persistent Pupillary Membrane (PPM) on Slit Lamp Ocular Examination

This membrane would be a remainder of the
Pupillary Membrane (PPM ... large enough to cause ... @oftalmopo #PPM
â–º
Causes of Post-Partum Fever - Differential Diagnosis Algorithm
6 W's for causes of PPF
 - Wind: pneumonia,
Causes of Post-Partum ... Algorithm 6 W's for causes ... of PPF - Wind ... PostPartum #Fever #PPF ... Diagnosis #Algorithm #Causes
Arterial Lines & Waveforms
Arterial lines permit continuous invasive blood pressure measurement, frequent arterial blood sampling, and
PRESSURE VARIATION (PPV ... Pressure Variation (PPV ... intrathoracic pressure and causes ... volume (increased PPV
Causes of Prolonged PT (INR), Prolonged PTT
 • Prolonged PT (INR), Prolonged PTT
 • Prolonged PT
Causes of Prolonged ... #Prolonged #PPT ... Diagnosis #Algorithm #Causes
4 T’s Mnemonic for Causes of Post-Partum Hemorrhage (PPH)

Tone (70%):
 - Uterine Atony
 - Tx: Massage,
s Mnemonic for Causes ... Post-Partum Hemorrhage (PPH ... Acronym #TTTT #PPH
Causes of Vitamin B12 Deficiency - Cobalamin
Decreased Intake
Pancreas: Insufficiency
Intestine: SIBO, Celiac disease, IBD, Lymphoma, Amyloidosis, Resection,
Causes of Vitamin ... : Medications (PPI ... differential #diagnosis #causes
Positive Predictive Value Calculation - Probability that someone with a positive test actually has the disease

Positive
PositivePredictiveValue #PPV ... Biostatistics #statistics
USMLE Epidemiology and Biostatistics Summary
Meta-Analysis: pools data from several studies (greater power), limited by quality/bias of
Proves cause-effect ... PPV: proportion ... prevalence is low, then PPV ... specificity -> higher PPV ... but not on the causal